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          <a class="text-dark" href="https://www.imooc.com/learn/755" target="_blank" rel="noopener noreferrer">
            <h5 class="card-title">CSS深入理解之border</h5>
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          <p class="card-text text-muted">
            本课程将深入讲解CSS中的border属性，深入介绍border-color之间的关系，以及border与background定位、border与透明边框，并教你如果使用border进行图形构建，以及如何借助border使用有限标签完成我们的布局。
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          <p class="card-text text-muted">
            本课程为CSS3教程，对于有一定CSS2经验的伙伴，能让您系统的学习CSS3，快速的理解掌握并应用于工作之中。在学习教程的过程中实例演示结合在线编程完成任务的方式来学习，相信自己动手会让你理解的更快，本教程能够让您学习效果更好！
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          <a class="text-dark" href="https://www.imooc.com/learn/9" target="_blank" rel="noopener noreferrer">
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      <div class="card">
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          <a class="text-dark" href="https://www.imooc.com/learn/931" target="_blank" rel="noopener noreferrer">
            <h5 class="card-title">CSS定位position</h5>
          </a>
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